(a) Streets shall be logically related to the topography so as to produce reasonable grades and suitable building sites and to reduce soil erosion and runoff into waterways.
(b) Proposed streets shall conform to the requirements of all adopted plans for the area and the requirements of this Zoning Code.
(c) Streets shall be constructed in accordance with the standards and requirements of the Streets Department.
(d) Streets in Residential districts shall be laid out to discourage through traffic to the degree consistent with the continuation of existing or proposed major streets or highways.
(e) If lots resulting from original subdivision are large enough to permit re-subdivision, or if a portion of the lot is not subdivided, adequate street rights-of-way to permit further subdivision shall be designated on the submitted preliminary plat.
(f) Where a subdivision abuts or contains an existing or proposed major street or highway, the Commission may require marginal access streets, driveways, reverse frontage lots, or such additional treatment as will reduce the number of intersections with that street or highway, separate local and through traffic, and provide protection for abutting properties.
(g) Dead end streets shall be prohibited, except as short stubs to permit future street extension into adjoining lots, or when designed as cul-de-sacs.
(h) Cul-de-sac streets shall not exceed 500 ft. in length and shall have at the closed end a turn-around containing a right-of-way having an outside radius of not less than 50 ft., which shall be paved to a radius of not less than 40 ft.
(i) Street Widths.
(.1) Minimum street right-of-way and cartway widths shall conform to the Comprehensive Plan or, if not shown on that plan, shall conform to the following:
(.a) Two-Way Streets.
(i) A primary residential street shall have a cartway 64 ft. wide included in the right-of- way, but in no case shall the right-of-way be less than 88 ft. wide.
(ii) A secondary residential street shall have a cartway 34 ft. wide included in the right-of- way, but in no case shall the right-of-way be less than 54 ft. wide.
(iii) A tertiary residential street shall have a cartway 26 ft. wide included in the right-of- way, but in no case shall the right-of-way be less than 50 ft. wide.
(iv) A marginal access street shall have a cartway 26 ft. wide, included in a right-of-way, but in no case shall the right-of-way be less than 36 ft. wide.
(.b) One-Way Streets.
A one-way street shall have a cartway 20 ft. wide, included in the right-of-way, but in no case shall the right-of-way be less than 44 ft. wide.
(.2) Additional right-of-way and cartway requirements may be established by the Commission in order to lessen congestion in the streets, to secure safety from fire, panic, and other dangers, to facilitate the adequate provision for transportation and other public requirements and to promote the general welfare.
(.3) Short extensions of existing streets with narrower right-of-way or cartway widths may be permitted at the discretion of the Commission.
(j) Street Alignment.
(.1) Whenever street lines are deflected more than five degrees, connection shall be made by horizontal curves.
(.2) To ensure adequate sight distance, center line radii for horizontal curves shall be not less than 150 ft. on primary residential streets and 100 ft. on secondary and tertiary residential streets.
(.3) A tangent of at least 50 ft. shall be required between reverse curves.
(k) Street Grades.
(.1) Centerline grades shall, wherever possible, be not less than three-fourths of one percent (0.75%).
(.2) Centerline grades shall not exceed ten percent (10%) on primary and secondary residential streets and twelve percent (12%) on tertiary residential streets.
(.3) Vertical curves shall be used at changes of grades exceeding three percent (3%) and shall be designed in relation to the extent of the grade change and to provide sight distances of at least 200 ft. on primary residential streets, 150 ft. on secondary residential streets, and 100 ft. on tertiary residential streets.
(.4) Where the grade of any street at the approach to an intersection exceeds four percent (4%), sufficient leveling areas having a maximum grade of four percent (4%) shall be provided for a distance of 25 ft. measured from the nearest right-of-way line of the intersecting street.
(l) Street Intersections.
(.1) Streets shall be laid out to intersect as nearly as possible at right angles. No street shall intersect another at an angle of less than 75 degrees.
(.2) Intersections with major streets or major highways should be reduced to a minimum.
(.3) Streets entering opposite sides of another street shall be laid out either directly opposite one another or with a minimum offset of 125 ft. between their center lines.
(.4) Curb radii shall be provided at street intersections varying according to the types of streets intersecting and the angle at which they intersect, but none shall be less than 15 ft.
(m) Sidewalks.
Each proposed public or private street shall include a sidewalk with a clear width of at least five ft. on both sides of the street unless the Streets Department waives the requirement based on public safety or site and topography constraints.